mongoose/docs/c-api/http.h/mg_parse_http.md

title	decl_name	symbol_kind	signature
mg_parse_http()	mg_parse_http	func	int mg_parse_http(const char *s, int n, struct http_message *hm, int is_req);

Parses a HTTP message.

is_req should be set to 1 if parsing a request, 0 if reply.

Returns the number of bytes parsed. If HTTP message is incomplete 0 is returned. On parse error, a negative number is returned.